Style: Consider allowing `and`, `or`, and `not` keywords in C++ code

[arcondello]

C++ supports and, or, not keywords. not especially seems much more readable to me in if-clauses

if (not std::is_sorted(range)) {}

vs

if (!std::is_sorted(range)) {}

Currently we don't use them anywhere in the code base, mostly because the Google C++ style guide disallows them

Also note that you should always use the punctuation operators, such as && and ~, rather than the word operators, such as and and compl.

But IMO we should diverge for readability. Though this is coming from someone who was raised on Python.